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Sökning: AMNE:(ENGINEERING AND TECHNOLOGY Medical Engineering Medical Laboratory and Measurements Technologies) > Localizing on-scalp...

  • Pfeiffer, Christoph,1989Chalmers tekniska högskola,Chalmers University of Technology (författare)

Localizing on-scalp MEG sensors using an array of magnetic dipole coils

  • Artikel/kapitelEngelska2018

Förlag, utgivningsår, omfång ...

  • 2018-05-10
  • Public Library of Science (PLoS),2018

Nummerbeteckningar

  • LIBRIS-ID:oai:gup.ub.gu.se/268382
  • https://gup.ub.gu.se/publication/268382URI
  • https://doi.org/10.1371/journal.pone.0191111DOI
  • https://research.chalmers.se/publication/503244URI
  • http://kipublications.ki.se/Default.aspx?queryparsed=id:138265879URI

Kompletterande språkuppgifter

  • Språk:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • Accurate estimation of the neural activity underlying magnetoencephalography (MEG) signals requires co-registration i.e., determination of the position and orientation of the sensors with respect to the head. In modern MEG systems, an array of hundreds of low- T c SQUID sensors is used to localize a set of small, magnetic dipole-like (head-position indicator, HPI) coils that are attached to the subject's head. With accurate prior knowledge of the positions and orientations of the sensors with respect to one another, the HPI coils can be localized with high precision, and thereby the positions of the sensors in relation to the head. With advances in magnetic field sensing technologies, e.g., high-T-c SQUIDs and optically pumped magnetometers (OPM), that require less extreme operating temperatures than low- T-c SQUID sensors, on-scalp MEG is on the horizon. To utilize the full potential of on-scalp MEG, flexible sensor arrays are preferable. Conventional co-registration is impractical for such systems as the relative positions and orientations of the sensors to each other are subject-specific and hence not known a priori. Herein, we present a method for co-registration of on-scalp MEG sensors. We propose to invert the conventional co-registration approach and localize the sensors relative to an array of HPI coils on the subject's head. We show that given accurate prior knowledge of the positions of the HPI coils with respect to one another, the sensors can be localized with high precision. We simulated our method with realistic parameters and layouts for sensor and coil arrays. Results indicate co-registration is possible with sub-millimeter accuracy, but the performance strongly depends upon a number of factors. Accurate calibration of the coils and precise determination of the positions and orientations of the coils with respect to one another are crucial. Finally, we propose methods to tackle practical challenges to further improve the method.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Andersen, L. M.Karolinska Institutet (författare)
  • Lundqvist, D.Karolinska Institutet (författare)
  • Hamalainen, M.Aalto-Yliopisto,Aalto University,The Harvard-MIT Division of Health Sciences and Technology,Massachusetts General Hospital and Harvard Medical School,Karolinska Institutet (författare)
  • Schneiderman, Justin F.,1979Gothenburg University,Göteborgs universitet,Institutionen för neurovetenskap och fysiologi,Institute of Neuroscience and Physiology,University of Gothenburg(Swepub:cth)justins (författare)
  • Oostenveld, R.Radboud Universiteit,Radboud University,Karolinska Institutet (författare)
  • Karolinska InstitutetChalmers tekniska högskola (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Plos One: Public Library of Science (PLoS)13:51932-6203

Internetlänk

Hitta via bibliotek

  • Plos One (Sök värdpublikationen i LIBRIS)

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